Reddit is a social news site allowing users to submit articles, vote on them, and engage in discussions. Like other social news websites, Reddit is divided into categories. In addition to being able to vote for and against articles, Reddit users receive karma for submitting popular articles.

Hacker News is a social news website that caters to programmers and entrepreneurs, delivering content related to computer science and entrepreneurship. It is run by Paul Graham's investment fund and...

A social bookmarking website for visual contents — vi.sualize.us allows you to remember your favorite images around the web, and share them with everyone. Sometimes, you are looking through pictures and one of...

4chan is a simple image-based bulletin board where anyone can post comments and share images. There are boards dedicated to a variety of topics, from Japanese animation and culture to videogames, music, and...

Events on Forekast are posted and voted on by the community. Users can then add comments to share even more knowledge. Subscribe or unsubscribe from various categories, to see only what you want. Set reminders...

Clipped summarizes news articles into bullet points. It's patent pending algorithm extracts the most important information from text so that you only have to read what matters. Read stuff blazing fast...

Hubski is a community for sharing thoughtful information and conversation. Here you can find interesting stories, ideas and events, and share what interests you with others. Your hub is made of your posts...

News for nerds, stuff that matters. Slashdot (aka /.) is a technology-related news and discussion site with a focus on Linux, free and open source software and information freedom and privacy issues. The...

Pligg is an open source CMS (Content Management System) that you can download and use for free. Pligg CMS provides social publishing software that encourages visitors to register on your website so that they...

Snapzu is basically reddit alternative. It is a bit better looking, and the community is rather small so far, but growing. Official description: Snapzu is a platform for web content creation, aggregation &...

Voat is a censorship-free community platform based in Switzerland where content is submitted, organized, moderated and voted on (ranked) by the users. Users can earn a percentage of our ad-revenue share for...

Karma is a Reddit client built for simplicity. Karma seeks to get out of the way and let you get back to what you want to do: view links, upvote comments, open orangereds, and amass that sweet, sweet karma. ...

LWN.net aims to be the premier news and information source for the free software community. We provide comprehensive coverage of development, legal, commercial, and security issues. The LWN.net Weekly Edition...

spreadit is a link aggregator and bullshit generator. It combines the best of structured conversations of reddit, the ability to embed code, LaTeX and community moderation from stackoverflow, and the...